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SAFETY  PRECAUTIONS
DESICCANT AIR DEHYDRATOR (TYPE II)

Fireman - Navy Firefighter, Fireman training manual
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dryers are used to remove most of the water vapor from compressed  air. The Navy uses two basic types of air dehydrators and a combination of the two. These air dehydrators are classified  as  follows: 1.  Type  I-refrigeration 2.  Type  II–heater,  desiccant 3. Type III-refrigeration, desiccant Each of these types meets the specified require- ments for the quality of the compressed air used in pneumatic control systems or for clean, dry air used for shipboard   electronic   systems.   Usually,   specific requirements  involve  operating  pressure,  flow  rate,  dew point,  and  purity  (percent  of  aerosols  and  size  of particles). We will briefly discuss each of the types of air dehydrators. REFRIGERATION  AIR  DEHYDRATOR (TYPE I) Refrigeration  is  one  method  of  removing  moisture from  compressed  air.  The  dehydrator  shown  in  figure 10-29  is  a  REFRIGERATION  DEHYDRATOR  or REFRIGERATED  AIR  DRYER.  This  unit  removes water vapor entrained in the stream of compressed air by condensing the water into a liquid that is heavier than air. Air flowing from the separator/holding tank first passes through the air-to-air heat exchanger, where some of the heat of compression is removed from the airstream. The air then moves through the evaporator section of the dehydrator, where the air is chilled by circulating refrigerant. In this unit, the airstream is cooled to a temperature that is below the dew point. This will cause the water vapor in the air to condense so the condensate drain system can remove it. After leaving the evaporator  section,  the  dehydrated  air  moves  upward through the cold air side of the air-to-air heat exchanger. Figure 10-29.—Dehydrator (type I). 10-32






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